{"id":21301,"date":"2021-08-18T11:08:09","date_gmt":"2021-08-18T09:08:09","guid":{"rendered":"https:\/\/www.software-developer-india.com\/?p=21301"},"modified":"2024-12-13T06:42:31","modified_gmt":"2024-12-13T04:42:31","slug":"hvad-er-enhedstest","status":"publish","type":"post","link":"https:\/\/www.software-developer-india.com\/da\/hvad-er-enhedstest\/","title":{"rendered":"Hvad er enhedstest"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Hvad er enhedstest<\/h2>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/www.software-developer-india.com\/wp-content\/uploads\/2021\/08\/software-testing.-1.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"575\" height=\"250\" src=\"https:\/\/www.software-developer-india.com\/wp-content\/uploads\/2021\/08\/software-testing.-1.jpg\" alt=\"\" class=\"wp-image-21321\" style=\"width:575px;height:250px\" srcset=\"https:\/\/www.software-developer-india.com\/wp-content\/uploads\/2021\/08\/software-testing.-1.jpg 575w, https:\/\/www.software-developer-india.com\/wp-content\/uploads\/2021\/08\/software-testing.-1-300x130.jpg 300w\" sizes=\"auto, (max-width: 575px) 100vw, 575px\" \/><\/a><\/figure>\n<\/div>\n<h3 class=\"wp-block-heading\"><strong>Forestil dig dette scenario:<\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\">En udvikler med et par m\u00e5neders erfaring under b\u00e6ltet, der kun brugte en haveberegning til at matche kundetestdata, syntes at v\u00e6re glad for, at resultaterne matchede. <\/p>\n\n<p class=\"wp-block-paragraph\">Der var f\u00e5 andre mindre beregninger, der blev bygget oven p\u00e5 de eksisterende beregninger. Der var dog nogle underliggende problemer i originalen, der var for\u00e5rsaget af un\u00f8jagtighederne i de nye beregninger. <\/p>\n\n<p class=\"wp-block-paragraph\">Hver gang et problem i den oprindelige beregning dukkede op, m\u00e5tte udvikleren foretage \u00e6ndringer af den eksisterende kode. Derefter skal udvikleren stadig k\u00f8re programmet med testinputparametre for at se, om problemet er l\u00f8st, eller om der skal foretages flere kode\u00e6ndringer. <\/p>\n\n<p class=\"wp-block-paragraph\">Dette er en meget omhyggelig proces, fordi udvikleren skal se, om andre beregninger skal \u00e6ndres, og om der er \u00e6ndringer p\u00e5virket af koden. Og spiser meget tid.<\/p>\n\n<h3 class=\"wp-block-heading\"><strong>Hvad er der galt her?<\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\">G\u00f8r ikke enhedstest. Hvis udvikleren havde arbejdet p\u00e5 det gennem processen med enhedstest, kunne han have sparet meget tid og k\u00f8re et skarpt testprogram, der viser hurtigere resultater. <\/p>\n\n<h3 class=\"wp-block-heading\"><strong>Da enhedstest blev til<\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\">Softwareudviklere har lavet en eller anden form for testning, s\u00e5 l\u00e6nge de kan huske. For hver innovation er der udviklet nye processer, og der blev vist automatiske test. Automatiseret testsoftware har eksisteret siden 1980&#8217;erne, men var ikke s\u00e5 raffineret som nu. Med automatiseret test kan udviklerne skrive koder for at teste programmet, og de kan k\u00f8re testene et vilk\u00e5rligt antal gange, de ville, og ikke med store vanskeligheder. <\/p>\n\n<p class=\"wp-block-paragraph\">Der er forskellige m\u00e5der at teste, om din software fungerer, og nogle gange kan forskellene mellem dem blive uskarpe. Imidlertid er de to hovedtyper af testning<strong> Enhedstest<\/strong> og<strong> Integrationstest<\/strong> . I integrationstest er form\u00e5let at kontrollere, om hele produktet fungerer godt som helhed. Og i Unit Testing er hele produktet opdelt i flere stykker og testet isoleret. Selve testen tager ikke meget tid, fordi kun sm\u00e5 dele af koden ville blive testet ad gangen.<\/p>\n\n<h3 class=\"wp-block-heading\"><strong>Betydningen af enhedstest<\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\">Enhedstest er en metode til at teste, om et bestemt softwareprogram fungerer, og om de enkelte komponenter i et softwareprogram har den brugervenlighed og funktionalitet, de var beregnet til. At teste korrekt ville hj\u00e6lpe med at opdage fejl. Tests udarbejdes i form af funktioner, og programmets v\u00e6rdi og adf\u00e6rd i overensstemmelse med disse funktioner ville blive bestemt. Dette g\u00f8res i forskellige scenarier, med resultaterne for \u00f8je for hvert scenario. N\u00e5r der sker en ugyldig situation, vil funktionen meddele, at der er sket noget galt, og logge det. <\/p>\n\n<p class=\"wp-block-paragraph\">Enhedstest ligner n\u00e6sten Test Driven Development eller TDD, hvor udviklerne f\u00f8rst skriver enhedstestene og derefter koderne. Disse er specifikke testcases, og softwaren skal best\u00e5 testene. Det er ogs\u00e5 lettere at skrive omfattende test, n\u00e5r individuelle enheder testes, og alle enhederne s\u00e6ttes sammen. <\/p>\n\n<p class=\"wp-block-paragraph\">Enhedstest er et vigtigt aspekt af den agile softwareudviklingsproces, og n\u00e5r den er angivet som en standardproces, kan fejl identificeres og udbedres. Det er ekstremt vigtigt at finde og udbedre defekter i de tidlige stadier af produktudvikling, og med enhedstest ville det blive mulig. Derfor b\u00f8r udviklere fokusere p\u00e5 at skrive gode testcases med tilstr\u00e6kkelig tid og milj\u00f8. <\/p>\n\n<p class=\"wp-block-paragraph\">Der er to m\u00e5der at udf\u00f8re enhedstest p\u00e5:<\/p>\n\n<ol class=\"wp-block-list\">\n<li>Manuel test<\/li>\n\n\n\n<li>Automatiseret test<\/li>\n<\/ol>\n\n<h3 class=\"wp-block-heading\"><strong>Manuel test<\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\">Manuel test sker, n\u00e5r testcases udf\u00f8res uden automatiseringsv\u00e6rkt\u00f8jer. Hvert af teststadierne styres og udf\u00f8res manuelt, og derfor en kedelig proces, s\u00e5 det er b\u00e5de omhyggeligt og tidskr\u00e6vende. <\/p>\n\n<h3 class=\"wp-block-heading\"><strong>Automatiseret test<\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\">Der vil v\u00e6re et automatiseringsv\u00e6rkt\u00f8j, der kan optage og teste programmet i etaper uden menneskelig indgriben. Det er vigtigt kun at k\u00f8re n\u00f8dvendige tests, og undg\u00e5 at lave tests af lav v\u00e6rdi. <\/p>\n\n<h3 class=\"wp-block-heading\"><strong>Fordele ved enhedstest<\/strong><\/h3>\n\n<h3 class=\"wp-block-heading\"><strong>Registrerer fejl tidligt i softwaren<\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\">Enhedstest hj\u00e6lper med at opdage fejl tidligt i softwareudviklingscyklussen, l\u00f8se dem og spare penge i det lange l\u00f8b. Eliminering af fejl i de tidlige faser er afg\u00f8rende, fordi opdagelse af dem senere kan for\u00e5rsage enorme udgifter senere. Debugging p\u00e5 h\u00f8jere niveauer kan v\u00e6re virkelig dyrt, for n\u00e5r du tester p\u00e5 h\u00f8jere niveauer, skal \u00e6ndringerne i koden kontrolleres lige fra begyndelsen. Og enhedstest fungerer kun med de seneste kode\u00e6ndringer. <\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.software-developer-india.com\/wp-content\/uploads\/2021\/08\/benefits.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"575\" height=\"250\" src=\"https:\/\/www.software-developer-india.com\/wp-content\/uploads\/2021\/08\/benefits.jpg\" alt=\"\" class=\"wp-image-21331\" srcset=\"https:\/\/www.software-developer-india.com\/wp-content\/uploads\/2021\/08\/benefits.jpg 575w, https:\/\/www.software-developer-india.com\/wp-content\/uploads\/2021\/08\/benefits-300x130.jpg 300w\" sizes=\"auto, (max-width: 575px) 100vw, 575px\" \/><\/a><\/figure>\n<\/div>\n<h3 class=\"wp-block-heading\"><strong>Softwareudviklingsprocessen bliver smidig<\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\">Enhedstest er en integreret del af agil softwareudvikling og giver udviklerne mulighed for at tilf\u00f8je nye funktioner og funktioner til den eksisterende software og foretage \u00e6ndringer i den gamle kode. Enhedstest g\u00e5r godt inden for principperne i det agile manifest, is\u00e6r det, der siger, at &#8220;&#8221; De bedste arkitekturer, krav og designs stammer fra selvorganiserende teams &#8220;, derfor bliver denne teknik et godt v\u00e6rkt\u00f8j til at teste, fordi de \u00e6ndringer, du foretager under udvikling kan faktisk bidrage til det bedste design og arkitektur. <\/p>\n\n<p class=\"wp-block-paragraph\">Implementering af agile metoder og enhedstest reducerer udviklernes arbejde i testfasen, og de kan fokusere p\u00e5 testmilj\u00f8et og skabe bedre omfattende integration og systemtest.<\/p>\n\n<h3 class=\"wp-block-heading\"><strong>Reducerer cyklomatisk kompleksitet<\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\">Cyklomatisk kompleksitet er et m\u00e5l for kodens kompleksitet, og kodens kompleksitet kan m\u00e5les gennem koded\u00e6kning. Med enhedstest vil du kunne forst\u00e5 de stier, du skal g\u00e5 gennem en kodeblok. Hvis koderne er komplekse, er det ikke let at komme til de h\u00f8je grader af enhedstestd\u00e6kning. At vide, om koden fungerer korrekt, afh\u00e6nger af, hvor kompleks koden er. <\/p>\n\n<h3 class=\"wp-block-heading\"><strong>Softwareprogrammet testes, f\u00f8r den rigtige version er ude<\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\">Hvem kan ikke lide at teste noget, f\u00f8r de rent faktisk g\u00f8r det? Uanset om det er en bil eller et stykke kosmetik, er det kun naturligt at teste dem ville give bedre information om, hvordan de ville fungere. Med enhedstest er det muligt at ud\u00f8ve koden og kontrollere, om den fungerer perfekt inden for overensstemmelse med dens parametre. <\/p>\n\n<p class=\"wp-block-paragraph\">Der er mennesker, der ikke underst\u00f8tter enhedstest, og de fort\u00e6ller dig, at din softwarelevering ville blive udsat p\u00e5 ubestemt tid, fordi enhedstest er sv\u00e6re at skrive, og det er ikke let at krydse alle scenarierne for at n\u00e5 det sidste leveringsstadium. Men hvis du ikke laver enhedstest og kommer p\u00e5 markedet med et upr\u00f8vet produkt, er fejl ikke langt bagud. <\/p>\n\n<h3 class=\"wp-block-heading\"><strong>Dokumentation<\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\">Hvem kan ikke lide dokumentation? Enhedstest og dens resultater er n\u00e6sten som dokumentation, fordi udviklere kan se, hvordan en software formodes at fungere, hvad der kan g\u00e5 galt, og hvordan det kan rettes. Hvis en ny udvikler til enhver tid slutter sig til virksomheden, ville kigge p\u00e5 denne dokumentation give dem en bedre chance for at forst\u00e5, hvordan en bestemt software blev bygget. <\/p>\n\n<p class=\"wp-block-paragraph\">Forst\u00e5 indsatsen og den tid, der kr\u00e6ves for at foretage en bestemt \u00e6ndring <\/p>\n\n<p class=\"wp-block-paragraph\">Det eneste, der er i overensstemmelse med et softwareprogram, er de \u00e6ndringer, der kommer til det med tiden. Med enhedstest ville udviklerne f\u00e5 en id\u00e9 om, hvor meget der skal til for at f\u00e5 \u00e6ndringerne til at fungere. Enhedstest giver v\u00e6rdier for, hvordan dette kan g\u00f8res, og hvis v\u00e6rdierne ikke er gode, ved du, at testene er mislykkedes, og m\u00e5den at foretage \u00e6ndringerne p\u00e5 skal v\u00e6re noget andet. <\/p>\n\n<h3 class=\"wp-block-heading\"><strong>Konklusion<\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\">Af ovenst\u00e5ende \u00e5rsager er det indlysende, at enhedstest er en integreret del af softwareudvikling. <\/p>\n\n<p class=\"wp-block-paragraph\">N\u00e5r hver funktion testes separat, hj\u00e6lper den med at opdage fejl og rette dem. Det er imidlertid vigtigt at v\u00e6re meget streng i disciplin og konsistens, hvis enhedstest skal udf\u00f8res med succes. Der er s\u00e5 mange v\u00e6rkt\u00f8jer til softwaretest, men forberedelse af gode tests kr\u00e6ver dygtighed og \u00f8velse. <\/p>\n\n<p class=\"wp-block-paragraph\">Interessante links:<\/p>\n\n<p class=\"wp-block-paragraph\"><a href=\"http:\/\/u-tor.com\/topic\/unit-testing-importance\">Enhedstest &#8211; hvad er dens betydning i softwaretest?<\/a><\/p>\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/aws.amazon.com\/what-is\/unit-testing\/\" title=\"Flere oplysninger om enhedstest\">Flere oplysninger om enhedstest<\/a><\/p>\n\n<p class=\"wp-block-paragraph\">Billeder: Canva<\/p>\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n<div class=\"wp-block-image\">\n<figure class=\"alignleft\"><img decoding=\"async\" src=\"https:\/\/www.software-developer-india.com\/wp-content\/uploads\/2015\/02\/1.jpg\" alt=\"\" class=\"wp-image-229\"\/><\/figure>\n<\/div>\n<p class=\"wp-block-paragraph\">Forfatteren: Sascha Thattil arbejder p\u00e5 Software-Developer-India.com, som er en del af YUHIRO Group. YUHIRO er en tysk-indisk virksomhed, der leverer programm\u00f8rer til IT-virksomheder, agenturer og IT-afdelinger.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n<div class=\"shariff\"><ul class=\"shariff-buttons theme-default orientation-horizontal buttonsize-medium\"><li class=\"shariff-button twitter shariff-nocustomcolor\" style=\"background-color:#595959\"><a href=\"https:\/\/twitter.com\/share?url=https%3A%2F%2Fwww.software-developer-india.com%2Fda%2Fhvad-er-enhedstest%2F&text=Hvad%20er%20enhedstest\" title=\"Del p\u00e5 X\" aria-label=\"Del p\u00e5 X\" role=\"button\" rel=\"noopener nofollow\" class=\"shariff-link\" style=\"; background-color:#000; color:#fff\" target=\"_blank\"><span class=\"shariff-icon\" style=\"\"><svg width=\"32px\" height=\"20px\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 24 24\"><path fill=\"#000\" d=\"M14.258 10.152L23.176 0h-2.113l-7.747 8.813L7.133 0H0l9.352 13.328L0 23.973h2.113l8.176-9.309 6.531 9.309h7.133zm-2.895 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Forestil dig dette scenario: En udvikler med et par m\u00e5neders erfaring under b\u00e6ltet, der kun brugte en haveberegning til at matche kundetestdata, &#8230; <a title=\"Hvad er enhedstest\" class=\"read-more\" href=\"https:\/\/www.software-developer-india.com\/da\/hvad-er-enhedstest\/\" aria-label=\"Read more about Hvad er enhedstest\">L\u00e6s Mere<\/a><\/p>\n","protected":false},"author":9,"featured_media":21322,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[159,325,169],"tags":[],"class_list":["post-21301","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-app-da","category-skrivning","category-udvikling"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.9 - aioseo.com -->\n\t<meta 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